Package signatures

To ensure the integrity of the libjpeg-turbo binary packages, the RPM and DEB files and the source tarball are signed using the following key:
https://www.libjpeg-turbo.org/key/LJT-GPG-KEY
https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x0338c8d8d9fda62cf9c421bd7ec2dbb6f4dbf434
and the Windows installers are signed using a code signing certificate.

2.1.4

Significant changes relative to 2.1.3

1. Fixed a regression introduced in 2.1.3 that caused build failures with Visual Studio 2010.

2. The tjDecompressHeader3() function in the TurboJPEG C API and the TJDecompressor.setSourceImage() method in the TurboJPEG Java API now accept "abbreviated table specification" (AKA "tables-only") datastreams, which can be used to prime the decompressor with quantization and Huffman tables that can be used when decompressing subsequent "abbreviated image" datastreams.

3. libjpeg-turbo now performs run-time detection of AltiVec instructions on OS X/PowerPC systems if AltiVec instructions are not enabled at compile time. This allows both AltiVec-equipped (PowerPC G4 and G5) and non-AltiVec-equipped (PowerPC G3) CPUs to be supported using the same build of libjpeg-turbo.

4. Fixed an error ("Bogus virtual array access") that occurred when attempting to decompress a progressive JPEG image with a height less than or equal to one iMCU (8 * the vertical sampling factor) using buffered-image mode with interblock smoothing enabled. This was a regression introduced by 2.1 beta1[6(b)].

5. Fixed two issues that prevented partial image decompression from working properly with buffered-image mode:

   • Attempting to call jpeg_crop_scanline() after jpeg_start_decompress() but before jpeg_start_output() resulted in an error ("Improper call to JPEG library in state 207".)
   • Attempting to use jpeg_skip_scanlines() resulted in an error ("Bogus virtual array access") under certain circumstances.